Self-proclaimed hamburger scholar George Motz made a documentary and a Travel Channel show devoted to burgers, he’s traversed the country to find the best beefy offerings and he wrote several meaty books, including “Hamburger America, a State-by-State Guide to Great Burger Joints,” which was lauded by Anthony Bourdain. Now, Motz is flipping the patty, opening his own place in Soho called Hamburger America. “I never had a plan to open a restaurant,” the Long Island native told The Post. “I started with a film on burgers and then got into cooking them. It was definitely an inverse to the usual...